Ryanair is to cease its Dublin to Cardiff route from Monday next due to a row over landing charges and will transfer the service to Bristol from Monday next.
However Aer Arann will begin operating a double daily service from Dublin to Cardiff on that day.
Ryanair said it decided not to renew its five-year agreement with Cardiff claiming the airport was looking to hike passenger charges by over 350 per cent.
Ryanair also accused the airport of reneging on elements of its current contract.
Ryanair's deputy chief executive, Michael Cawley, said, "Cardiff Airport is pricing itself out of the low fares market. Cost increases of the order of 350% belong to an era when the lowest air fare from Ireland to the UK was €250.
"Ryanair has a wide choice of competitive airports available to it and, with effect from Monday next, 1st May, we will be transferring these services to Bristol International Airport."
For those flights up to May 10 thRyanair will provide coach services between the two airports.
Ryanair said it will be offering refunds to any passengers who have already booked on these Cardiff flights and who don't wish to travel to Bristol.